3557 OLPC - libertas, add support for 802.11n 5 GHz networks on 8787. Due to a firmware limit of 14 channels in a scan request, the scan logic was heavily changed. During association a specific channel scan order is followed, and the first match stops further scanning. The LEDs test was also changed to reduce the time taken. ticket #12552.

3555 OLPC - startup sound. Avoid searching jffs2 filesystem on XO-1 because mounting it takes a long time. Avoid checking for file existence; just try and if we fail, fallback to the built-in sound. Avoids one microSD or eMMC power cycle from boot on XO-1.5, XO-1.75, and XO-4 when the startup sound is present.